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2013 Vol.29, Issue 5 Preview Page
Recommendation of I-D Criterion for Steep-Slope Failure Estimation Considering Rainfall Infiltration Mechanism

강우침투 메커니즘을 이용한 급경사지 붕괴예측 I-D 기준식 제안

Young-Karb Song1
,
Young-Uk Kim2
,
Dong-Wook Kim3*
송 영갑1
,
김 영욱2
,
김 동욱3*
1Senior Researcher, National Disaster Management Institute
2Prof., Dept. of Civil & Environmental Eng., Myongji Univ.
3Senior Researcher, Dept. of Geotech. Research Eng’g Div., Korea Institute of Construction Technology
1국립재난안전연구원 선임연구원
2명지대학교 토목환경공학과 교수
3한국건설기술연구원 수석연구원
*교신저자. *Corresponding Author. 
31 May 2013. pp. 65-74
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Abstract

The natural disaster occurrences and the loss of lives caused by the steep-slope failures in Korea were investigated in this study. The investigation includes the frequency rate of the steep-slope failures with respect to the characteristics of precipitation, underlying bedrock, and weathered soils. Analysis on the problems in the existing estimation methods of steep-slope failure was also undertaken, and a new model using unsaturated infinite slope stability was developed for the better slope failure estimation. The slope analyses by the newly developed model were performed considering unsaturated infinite slope, the gradient of slope, and hydro/mechanical properties of soils. Steep-slope failure estimation criterion is proposed based on the analysis results. In addition, the precipitation amount corresponding to warning stages against steep-slope failure is provided as an equation of Intensity-Duration criterion.

Keywords
Failure estimation
Infinite slope stability
Hydro/Mechanical properties
I-D criterion equation

본 연구에서는 우리나라에서 발생된 자연재해 및 급경사지 재해 사망자 현황을 분석하고, 급경사지 붕괴사례를 대상으로 강우특성과 기반암 풍화토에 따른 재해 발생빈도를 분석하였다. 또한, 선행연구에서 제시한 급경사지 붕괴예측 기준을 고찰하여 한계점을 도출하고, 불포화 무한사면 안정이론을 도입하여 급경사지 붕괴예측 기준으로 활용하고자 하였다. 지반의 경사, 수리적-역학적 특성을 고려할 수 있는 불포화 무한사면의 안정이론을 이용하여 안정해석을 수행하였으며, 산정된 안전율에 안전수준을 나타낼 수 있는 경계기준을 제시하여 급경사지 붕괴예측 기준을 제안하였다. 또한 급경사지 붕괴 위험단계에 해당하는 강우량을 Intensity-Duration 기준 수식으로 제시하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :5
  • Pages :65-74
  • Received Date : 2013-04-02
  • Accepted Date : 2013-05-21
  • DOI :https://doi.org/10.7843/kgs.2013.29.5.65
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